Single-photon quantum Raman spectroscopy for stand-off, hand-held detection of gas-phase molecules

Anthony O. Ojo; Roman Spesyvtsev; Stuart Bennett; John Leck; David Stothard

doi:10.1117/12.3014496

10 June 2024 Single-photon quantum Raman spectroscopy for stand-off, hand-held detection of gas-phase molecules

Anthony O. Ojo, Roman Spesyvtsev, Stuart Bennett, John Leck, David Stothard

Proceedings Volume 13056, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XXV; 130560S (2024) https://doi.org/10.1117/12.3014496
Event: SPIE Defense + Commercial Sensing, 2024, National Harbor, Maryland, United States

Abstract

As the world pivots away from hydrocarbon to hydrogen energy sources, new detection methodologies will be required to maintain safety. A critical factor in the safe use of hydrogen energy sources is access to low-cost, high-performance stand-off detection technology which can readily and autonomously detect hydrogen leaks. The tried-and-trusted path of absorption spectroscopy cannot be utilized with hydrogen due to the absence of optical absorption features for hydrogen. In addition to this, the difficulty in performing range-resolved absorption measurements, precludes the use of backscatter-absorption techniques for hydrogen detection. However, the significant Raman scattering cross-section for hydrogen can be exploited as a route to detection. This approach mandates the use of time-correlated single photon techniques and so confers significant advantage over absorption techniques: specifically, revealing the nature and position of the target substance. We therefore exploit hydrogen’s Raman-scattering cross-section, together with state-of-the-art UV excitation laser and single-photon detection technology to realize a practical handheld system permitting sub-percent level measurements within a 3m range with ~1second integration times. In this paper, we will outline the need for this detection methodology; the challenges associated with realizing practical systems based upon it; and demonstrate our recently developed hand-held hydrogen sensing device.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Anthony O. Ojo, Roman Spesyvtsev, Stuart Bennett, John Leck, and David Stothard "Single-photon quantum Raman spectroscopy for stand-off, hand-held detection of gas-phase molecules", Proc. SPIE 13056, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XXV, 130560S (10 June 2024); https://doi.org/10.1117/12.3014496

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KEYWORDS

Single photon detectors

Molecules

Raman spectroscopy

Molecular spectroscopy

Quantum detection

Hydrogen

Clouds

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